US7673131B2 - Booting an operating system in discrete stages - Google Patents

Booting an operating system in discrete stages Download PDF

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Publication number
US7673131B2
US7673131B2 US11/418,761 US41876106A US7673131B2 US 7673131 B2 US7673131 B2 US 7673131B2 US 41876106 A US41876106 A US 41876106A US 7673131 B2 US7673131 B2 US 7673131B2
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United States
Prior art keywords
image
operating system
boot
primary boot
boot image
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US11/418,761
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US20070260868A1 (en
Inventor
Patrick B. Azzarello
Anil A. Ingle
Richard A. Pletcher
Saad Syed
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Microsoft Technology Licensing LLC
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Microsoft Corp
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Priority to US11/418,761 priority Critical patent/US7673131B2/en
Assigned to MICROSOFT CORPORATION reassignment MICROSOFT CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INGLE, ANIL A., PLETCHER, RICHARD A., SYED, SAAD, AZZARELLO, PATRICK B.
Priority to CN2007800161139A priority patent/CN101438266B/zh
Priority to BRPI0710288-7A priority patent/BRPI0710288A2/pt
Priority to PCT/US2007/009330 priority patent/WO2007130267A1/en
Priority to KR1020087026854A priority patent/KR101365904B1/ko
Priority to EP07755561.3A priority patent/EP2021940B1/en
Priority to ES07755561T priority patent/ES2699712T3/es
Priority to JP2009509586A priority patent/JP5307706B2/ja
Priority to RU2008143215/08A priority patent/RU2439678C2/ru
Publication of US20070260868A1 publication Critical patent/US20070260868A1/en
Publication of US7673131B2 publication Critical patent/US7673131B2/en
Application granted granted Critical
Assigned to MICROSOFT TECHNOLOGY LICENSING, LLC reassignment MICROSOFT TECHNOLOGY LICENSING, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MICROSOFT CORPORATION
Expired - Fee Related legal-status Critical Current
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • G06F9/4401—Bootstrapping
    • G06F9/4406—Loading of operating system
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/16—Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/22—Microcontrol or microprogram arrangements
    • G06F9/24—Loading of the microprogram

Definitions

  • PXE Intel Pre-Boot Execution Environment
  • a computing device is configured to assemble and boot an operating system in stages using discrete operating system images. Each subsequent image of the operating system that is obtained builds upon the last image and when the operating system images are combined they create a complete operating system.
  • a primary boot image is first obtained for the device that includes enough of the operating system to support basic networking capabilities. Once the primary boot image is obtained, either through download or from local storage on the device, the primary boot image is booted to start the networking client. Once the networking client is active, the boot activity for the device is suspended. This provides an opportunity to authenticate the client, server and possibly user, and then one or more secondary operating system images are downloaded by the device using a richer network platform provided by the primary boot image. These secondary operating system images are chained to the primary boot image thereby creating a single/cohesive operating system. These secondary operating system images each build upon the functionality of the previous stage.
  • FIG. 1 illustrates an exemplary computing architecture that includes an operating system that is booted in discrete stages
  • FIG. 2 shows an exemplary file system that is configured to support booting an operating system in discrete stages
  • FIG. 3 shows a phased timeline for booting a device in discrete stages
  • FIG. 4 shows a process for booting an operating system in discrete stages.
  • FIG. 1 and the corresponding discussion are intended to provide a brief, general description of a suitable computing environment in which embodiments may be implemented.
  • program modules include routines, programs, components, data structures, and other types of structures that perform particular tasks or implement particular abstract data types.
  • Other computer system configurations may also be used, including hand-held devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers, and the like.
  • Distributed computing environments may also be used where tasks are performed by remote processing devices that are linked through a communications network.
  • program modules may be located in both local and remote memory storage devices.
  • FIG. 1 an illustrative computer architecture for a computer 100 utilized in the various embodiments will be described that includes an operating system that is booted in discrete stages.
  • the computer architecture shown in FIG. 1 may be configured as a mobile computing device and/or a conventional computing device.
  • computing device 100 may be configured as a smart phone, a PDA, a desktop computer, a server, a tablet, a laptop computer, and the like.
  • Computing device 100 may also be configured as an embedded computing device.
  • computer 100 includes a central processing unit 5 (“CPU”), a system memory 7 , including a random access memory 9 (“RAM”) and a read-only memory (“ROM”) 11 , and a system bus 12 that couples the memory to the CPU 5 .
  • System memory 7 may be any combination of non-volatile memory and volatile memory.
  • the computer 100 may include a mass storage device 14 for storing an operating system 16 that comprises (once obtained) a primary boot image 26 and one or more secondary operating system images 34 .
  • Operating system 16 is booted in stages.
  • a primary boot image 26 may be retrieved from storage on device 100 or it may be downloaded from a network location, such as from server 34 .
  • the primary boot image 30 may be obtained from server 34 by utilizing the PXE standard to download the primary boot image 30 .
  • the primary boot image includes enough of the operating system 16 to support basic networking. Once the primary boot image is obtained, either through download or from storage on the device, the primary boot image 26 is booted on device 100 to start the networking for device 100 .
  • the boot activity for device 100 is suspended and one or more secondary operating system images 32 are downloaded by the device ( 34 ).
  • Each secondary operating system image of the operating system 16 that is obtained builds upon the last operating system image that has been received.
  • These secondary operating system images 17 are chained to the primary boot image 26 to create a single/cohesive operating system 16 .
  • the operating system images ( 17 and 26 ) are stored as separate images on mass storage device 14 but appear to applications on device 100 as a single cohesive file system (See FIG. 2 and related discussion).
  • Operating system 16 may be configured to successively continue to boot each operating system image after it is chained with the previous image. Alternatively, any combination of operating system images may be chained and then the boot phase is continued.
  • Each successive operating system image builds upon the functionality of the previous operating system image. While other devices may boot an operating system in stages they do not use the same operating system throughout the process. Generally, these systems perform the critical functionality in the BIOS or a secondary operating system to initially boot the device and then replace that functionality with a replacement operating system.
  • the mass storage device 14 is connected to the CPU 5 through a mass storage controller (not shown) connected to the bus 12 .
  • the mass storage device 14 and its associated computer-readable media provide non-volatile storage for the computer 100 .
  • computer-readable media can be any available media that can be accessed by the computer 100 .
  • Computer-readable media may comprise computer storage media and communication media.
  • Computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data.
  • Computer storage media includes, but is not limited to, RAM, ROM, EPROM, EEPROM, flash memory or other solid state memory technology, CD-ROM, digital versatile disks (“DVD”), or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by the computer 100 .
  • the computer 100 may operate in a networked environment using logical connections to remote computers through a network 18 , such as the Internet.
  • the computer 100 may connect to the network 18 through a network interface unit 20 connected to the bus 12 .
  • the network interface unit 20 may also be utilized to connect to other types of networks and remote computer systems.
  • the connection may be a wired and/or wireless connection.
  • a number of program modules and data files may be stored in the memory of the computer 100 , including an operating system 16 suitable for controlling the operation of a computing device.
  • the computing device 100 may be an embedded system that includes an embedded operating system as well as other embedded data, files and applications.
  • all or some of the memory may be FLASH memory, or some other suitable memory for embedded systems.
  • the mass storage device 14 and RAM 9 may also store one or more program modules.
  • FIG. 2 shows an exemplary file system that is configured to support booting an operating system in discrete stages.
  • file system 200 includes application 202 , file system requests 204 , virtual file system 230 that comprises boot driver 234 and underlying file system 232 comprising primary image 236 and secondary image(s) 238 .
  • Boot driver 234 allows the operating system images (primary image 236 and secondary image(s) 238 ) to be viewed as a cohesive file system by any application, such as application 202 .
  • Each operating system image (primary image 236 and secondary image(s) 238 ) that is stored independently as separate files may be loaded as an overlay and appear to the system as a single set of files within virtual file system 230 .
  • the operating system images may be stored in underlying file system 232 and/or in RAM in which case boot driver 234 accesses the operating systems directly from memory.
  • boot driver 234 when loading an image of the complete operating system, loads each of the operating system images that are present within the RAM and/or underlying file system and chains the operating system images. Chaining the primary boot image 236 with the secondary operating system image(s) 238 allows the operating system to boot from multiple files.
  • boot driver 234 examines configuration information to identify the appropriate operating image to initially boot from. If the configuration information is not available, or not found, the boot driver 234 looks for a boot file at the root level of the underlying file system 232 .
  • primary image 236 is configured to provide a minimal set of network functionality such that secondary image(s) 238 may be obtained using standard networking protocols.
  • FIG. 3 shows a phased timeline for booting a device in discrete stages. As illustrated, the timeline is divided into a POST/DHCP phase 310 , a PXE phase 320 , a primary boot image download phase 330 , a secondary image download phase 340 , and a final boot phase 350 . Each phase of the process is marked by a specific event along with a basic description of tasks and events identified within each phase.
  • a Power On Self Test runs.
  • the network interface card (NIC) of the device sends a DHCP discovery message to obtain an IP address for the device.
  • the DHCP request includes information to request PXE boot information as well as to request the location of a PXE server.
  • the device requests and receives the PXE boot information and downloads the network bootstrap and the operating system loader, such as OS Loader.
  • Other boot configuration data and information may also be obtained.
  • the location of the primary boot image whether to download the primary boot image from a server or obtain it from a local mass storage device may be obtained.
  • the primary boot image may be stored on the device.
  • the PXE phase 320 and the primary boot image download phase 330 may be skipped.
  • the device does not already include the primary boot image, the device sends the PXE request to the server.
  • TFTP is used to download the PXE bootstrap program (startrom), operating system loader (OS Loader), boot configuration data and other files as designated in the PXE response.
  • startrom PXE bootstrap program
  • OS Loader operating system loader
  • boot configuration data boot configuration data and other files as designated in the PXE response.
  • the process moves to the primary boot image download phase 330 where the device loads the OS Loader, which according to one embodiment: creates a RAM disk and downloads a primary boot image using TFTP, and puts that image in the RAM disk.
  • the OS Loader begins the boot process and uses a unicast (TFTP) protocol to download the primary boot image. Once downloaded, these basic operating system components including a kernel, a networking client, drivers, etc., get loaded by the device.
  • TFTP unicast
  • the primary boot image provides more functionality before the complete operating system is loaded.
  • the primary boot image components include: RAM disk management; Multicast client; Device Identity Application; and State application.
  • the primary boot image download phase 330 the definition for the remaining operating system image is downloaded, the RAM disk is resized to accept the secondary image(s), and any device identity/state packages are downloaded (using a unicast protocol for efficiency).
  • the native multicast client is then started, and a request is sent to the multicast server. If the multicast server is not “broadcasting”, it will begin broadcasting the appropriate secondary image(s). If it is already broadcasting secondary operating system images, it queues up the requested image for this client. The device then begins to “listen” for the multicast broadcast, accepts data that is specified in the image definition, and reassembles or processes the secondary image into the RAM disk. When reassembly is complete, device identity and state information are applied, and the boot process for the device is resumed. Alternatively, the operating system images may be obtained using the unicast protocol.
  • the secondary operating system image(s) are downloaded to enhance the functionality of the operating system by moving from a lightweight, generic networking operating system to a fully configured operating system, such as a MICROSOFT WINDOWS® operating system by MICROSOFT CORPORATION of Redmond, Wash.
  • the boot process continues using the same operating system base that was used in the bootstrap step without requiring a reboot of the system.
  • FIG. 4 shows a process 400 for booting an operating system in discrete stages. After a start operation, the process moves to operation 405 where the primary boot image is obtained. Decision block 410 determines whether the primary boot image is stored on disk or whether the primary boot image is stored at a network location.
  • the process moves to operation 420 where the primary boot image is obtained from the device.
  • the process moves to operation 415 where the primary boot image is obtained from the network location.
  • the primary boot image includes enough networking capabilities to instantiate a network client on the device.
  • the boot process is started at operation 425 .
  • the networking client is loaded at operation 430 .
  • the boot process for the device is paused at operation 435 .
  • the process may move to authentication operation 438 which provides an opportunity to authenticate one or more of: the client, a server and the user. Failure to authenticate one of the above may cause the boot process to be aborted.
  • the boot process continues to operation 440 so that one or more secondary operating system images may be obtained.
  • the secondary image(s) provide more functionality to the operating system.
  • the networking client may use secure protocols to download the secondary image(s) as well as providing multicast support.
  • the recently obtained secondary operating system image is chained to the previous image.
  • the first secondary operating system image is obtained it is chained to the primary boot image.
  • the chaining of the images creates a logical image of a single operating system as discussed above with regard to FIG. 2 .
  • the operating system may comprise any number of secondary operating system images. For example, one complete operating system may include two secondary operating system images while another complete operating system may include three or more secondary operating system images.
  • continue operation 455 where the boot process is continued to add the functionality of the newly chained operating system images.
  • continue process 455 is illustrated after all of the secondary operating system images are obtained, the boot process may alternatively be continued after each secondary image is obtained. The process then moves to an end operation and returns to processing other actions.

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  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computer Security & Cryptography (AREA)
  • Stored Programmes (AREA)
  • Information Transfer Between Computers (AREA)
US11/418,761 2006-05-05 2006-05-05 Booting an operating system in discrete stages Expired - Fee Related US7673131B2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US11/418,761 US7673131B2 (en) 2006-05-05 2006-05-05 Booting an operating system in discrete stages
ES07755561T ES2699712T3 (es) 2006-05-05 2007-04-17 Inicialización de un sistema operativo en etapas discretas
RU2008143215/08A RU2439678C2 (ru) 2006-05-05 2007-04-17 Начальная загрузка операционной системы раздельными стадиями
PCT/US2007/009330 WO2007130267A1 (en) 2006-05-05 2007-04-17 Booting an operating system in discrete stages
KR1020087026854A KR101365904B1 (ko) 2006-05-05 2007-04-17 운영 체제를 개별 스테이지들에서 부팅하기 위한 컴퓨터 구현 방법, 개별 스테이지들에서 부팅되는 운영 체제를 포함하는 장치, 및 컴퓨터 판독가능 매체
EP07755561.3A EP2021940B1 (en) 2006-05-05 2007-04-17 Booting an operating system in discrete stages
CN2007800161139A CN101438266B (zh) 2006-05-05 2007-04-17 按照离散的级引导操作系统
JP2009509586A JP5307706B2 (ja) 2006-05-05 2007-04-17 オペレーティングシステムの段階的ブート処理
BRPI0710288-7A BRPI0710288A2 (pt) 2006-05-05 2007-04-17 carregamento de um sistema operacional em estágios discretos

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US7673131B2 true US7673131B2 (en) 2010-03-02

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US (1) US7673131B2 (zh)
EP (1) EP2021940B1 (zh)
JP (1) JP5307706B2 (zh)
KR (1) KR101365904B1 (zh)
CN (1) CN101438266B (zh)
BR (1) BRPI0710288A2 (zh)
ES (1) ES2699712T3 (zh)
RU (1) RU2439678C2 (zh)
WO (1) WO2007130267A1 (zh)

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CN101438266B (zh) 2012-10-10
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EP2021940A1 (en) 2009-02-11
WO2007130267A1 (en) 2007-11-15
EP2021940B1 (en) 2018-09-05
JP2009536399A (ja) 2009-10-08
KR101365904B1 (ko) 2014-02-21
RU2008143215A (ru) 2010-05-10
JP5307706B2 (ja) 2013-10-02
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RU2439678C2 (ru) 2012-01-10
US20070260868A1 (en) 2007-11-08

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